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Holocene Chronology of the Brattforsheden Delta and Inland Dune Field, SW Sweden

Author:
  • Helena Alexanderson
  • Derek Fabel
Publishing year: 2015
Language: English
Pages: 1-16
Publication/Series: Geochronometria
Volume: 42
Issue: 1
Document type: Journal article
Publisher: WIND-J WOJEWODA PUBLISHING CO.

Abstract english

Brattforsheden is a large glacifluvial deposit in southwestern Sweden and associated with it is one of Sweden's largest inland dune fields. Although the relative ages of the Brattforsheden deposits are well known, absolute ages from the area are few. In this study we have used optically stimulated luminescence (OSL), surface exposure (Be-10) and radiocarbon (C-14) dating to provide an absolute chronology for the deglaciation and for the Holocene development of the aeolian dunes. Our data show that the deglaciation took place just before 11 ka (11.5 +/- 0.6 ka OSL, 11.3 +/- 0.8 ka Be-10), in line with the C-14-based regional deglaciation age. Aeolian dunes started forming immediately after deglaciation and were active for at least 2000 years, well after vegetation had established. Renewed aeolian activity occurred 270-180 years ago, resulting in the deposition of sand sheets. Comparison between dating methods and studies of OSL dose distributions show that glacial, glacifluvial and littoral sediments suffer from incomplete bleaching and thus that mean OSL ages from such deposits overestimate the true depositional age. By using small aliquots and statistical age models, this effect can partly be countered. Also, some of the Be-10 ages appear too old, which may be due to previous exposure.

Keywords

  • Geology
  • luminescence (OSL) dating
  • surface exposure dating (Be-10)
  • deglaciation
  • aeolian
  • Holocene
  • Sweden

Other

Published
  • Lund Luminescence Laboratory
  • Aeolian activity in Sweden: an unexplored environmental archive
  • Lund Luminescence Laboratory-lup-obsolete
  • ISSN: 1897-1695
Helena Alexandersson
E-mail: helena [dot] alexanderson [at] geol [dot] lu [dot] se

Professor

Quaternary Sciences

+46 46 222 44 83

435

16

Aeolian sand project

Project members
Members of the aeolian sand project: Martin Bernhardson, Sara Florén, Edyta Kalińska-Nartiša and Helena Alexanderson.

Read more about the project here.